JPS5950724B2 - Enclosure equipment for metallurgical furnaces - Google Patents

Description

[Detailed description of the invention] The present invention relates to an enclosure device for steel manufacturing equipment.

Pneumatic steelmaking equipment generally includes an open top furnace with a gas supply system for providing a certain amount of oxygen to the molten iron.

For example, a Q-BOP type pneumatic converter has a lining extending through its lower end to inject oxygen more downwardly into the surface of the molten metal in the furnace, and also has a hydrocarbon shielding fluid, such as natural gas, propane, or diesel oil. It is injected surrounding oxygen to extend the life of the blade.

The reactions within the furnace and the dissociation of the shielding fluid cause contaminant gases and particulate matter to be exhausted from the open end of the furnace.

To prevent the release of pollutants into the atmosphere, such furnaces are often provided with a smoke hood connected to the gas purification system.

Such smoke hoods are usually located above the open top of the furnace, making it impossible to completely collect the exhaust gases when the furnace is tilted to receive heated metal or scrap.

Therefore, an enclosure device is provided around the furnace to prevent the discharge of contaminants during the charging operation.

An inlet door is provided on the side of the housing that tilts the furnace so that the heated metal ladle and scrap charging chute can be moved into the furnace charging inlet opening.

The charging ladle is typically moved using an overhead crane into position for charging the heated metal into the furnace.

The ladle is supported by hooks and cables from an overhead crane.

The ladle filled with molten metal has a large inertia as it moves toward the entrance opening, and its supporting hooks or cables collide with the entrance door support frame, causing significant damage and making it impossible to close the entrance door. sometimes occurs.

SUMMARY OF THE INVENTION It is a primary object of the present invention to provide an enclosure for a steelmaking equipment having means for protecting the entrance door support assembly from damage by metal charging equipment.

A more particular object of the present invention is to provide a protector for a converter enclosure having means for absorbing the impact energy of heated metal ladle support hooks and cables that may come into contact with the enclosure inlet opening during charging operations. .

These and other objects and advantages of the present invention will become clearer from the detailed description based on the following figures.

Although the present invention will be described with respect to the bottom blowing converter 10 shown in FIG. 1, it will be apparent to those skilled in the art that it is also applicable to side type converters such as basic oxygen systems and argon-oxygen systems. Dew.

Furnace 10 is open at the top and includes a metal shell 11 and a refractory lining 12, as shown in FIG.

A plurality of tuyeres 13 extend through the lower end of the furnace 10 and each include an inner tuyere tube 13a and an outer tuyere tube 13b to permit injection of oxygen and hydrocarbon shielding fluids.

As can be seen, the hydrocarbons injected around the oxygen channeled through the inner siding tube 13a increases the life of the tuyeres and the surrounding portion of the refractory lining 12.

A converter 10 of the type shown is generally supported in a conventional manner on a trunnion ring 14 with a trunnion pin extending from each opposite side.

The trunnion pin 15 is supported in a known manner on a conventional bearing assembly (not shown) and is supported by a suitable drive mechanism (
(not shown).

Furnace 10 is shown in FIG. 1 and is disposed within a metal enclosure 16 which includes a top wall 17 disposed above the upper end of the furnace.
and a sloped rear wall portion 18 extending downwardly and outwardly from the top wall 17 toward the upper end of the vertical rear wall portion 19.

Furthermore, as shown in FIG.
``Includes a vertical end wall 21.

Skirt portion 22 extends downwardly and outwardly from the lower ends of rear wall 19 and front wall 20.

A rectangular opening 23 is formed in the front wall 20 on one side of and parallel to the inclined axis of the trunnion pin 15.

The enclosure door assembly 24 is movably mounted relative to the opening 23 into and out of a closed position.

The top opening 26 has a cover 17 for receiving a smoke hood 27.
The smoke hood is preferably water-cooled and is formed from a plurality of individual, longitudinally extending tubes 28 connected at one end to a manifold tube (not shown). has been done.

A movable skirt 32 is disposed around the lower end of the smoke hood 27 and is also comprised of a plurality of tubes whose ends are connected to a cooling fluid inlet manifold 33 and an outlet manifold 34.

As will be appreciated, the skirt 32 can be moved vertically by means (not shown) between the positions shown in solid and dashed lines in FIG.

When the furnace 10 is in the pivoted position shown in FIG. 1 to receive molten metal from the ladle 35, the skirt 32
is in the raised position indicated by the solid line in FIG.

After the furnace 10 returns to its vertical position aligning the open mouth 36 with the hood 27, the skirt 32 is lowered to the position shown in phantom, where it is located near the furnace mouth 36.

The main oxygen blow begins and the exhaust gas flows upward into the hood 27.

A second opening 42 is formed in the cover 17 above the inlet opening 23 for receiving the lower end of the auxiliary smoke hood 44.

As can be seen, the first smoke hood 27 is connected by conduit 45 to a gas cleaning system (not shown), which system includes, for example, a quench cooler (not shown) and a gas scrubber (not shown).

The quench and gas scrubbers may be variable throat venturi type wet scrubbers, which are well known and serve to remove particulates and reduce the temperature of the exhaust gas exiting the furnace 10.

Additionally, a suction device, such as a fan (not shown), is provided under the hood 27 to generate suction within the enclosure 16.

The auxiliary smoke hood 44 is connected to the gas purification system between the quench cooler and scrubber by a second conduit 50 and a valve (not shown).

A more complete description of the gas purification system coupled to the smoke hood 27 is provided in our co-pending U.S. Patent Application No. 340.302.
No., filed March 12, 1973.

The door assembly 24 consists of two doors 24a and 24b, which are mounted on a support assembly 60 so as to be horizontally movable toward and away from each other.

Each of the doors 24a and 24b includes an upper rectangular, vertically extending portion 62 and a second rectangular portion 64 attached to the lower end of portion 62 and extending diagonally outwardly therefrom. It extends so that the furnace 10 can rotate.

Door support assembly 60 includes a first pair of rails 75a and 75b that are aligned and extend from adjacent the lower outer corners of doors 24a and 24b and away from the doors, respectively. extends parallel to it.

Roller assemblies 76a and 76b are connected to rails 75a and 75.
is provided at each of the lower outer corners of doors 24a and 24b to cooperate with door b.

Each roller assembly includes a bracket 78 attached to its associated door panel 64, each bracket including a suitable bearing for receiving a vertically extending shaft 81 having a roller 83 at its lower end.

The support frame 60 is disposed on the opposite side and the door assembly 2
The horizontal beam member 86 includes a pair of horizontal beam members 86 bridging the upper ends of a pair of vertical columns 85 spaced apart from each other.

Two pairs of parallel rails 88a and 88b are provided on member 86, one pair disposed above and parallel to the upper edges of doors 24a and 24b.

Furthermore, a pair of bracket members 90a, 91a and 90b,
91b are attached to doors 24a and 24b, respectively, in a spaced-apart relationship and extend 1" upwardly from their respective doors.

The pair of rollers 92a are connected to the bracket 9. Attached to the upper ends of each of Oa and 912, and similarly attached to each bracket) 91a and 91b, each roller engages its associated rail 88a or 88b.

Doors 24a and 24b are moved laterally away from each other toward the open position by drive assemblies 95a and 95b.

Both assemblies are the same, so for the sake of brevity, only assembly 95a will be described in detail.

Any suitable type of drive can be used, but
In the illustrated embodiment, drive assembly 95a includes a drive motor 98 located adjacent the upper end of crossbeam 86.

Motor 98 is connected by a suitable gear or chain and sprocket drive to drum 99, around which cable 101 is wound.

The second drum 102 is rotatably mounted on a suitable bearing so as to rotate about an axis parallel to the axis of the drum 99, and the inner edge of the door 24a is displaced therefrom at a location above the door.

Cable 101 is wound around drum 102,
Its ends are attached to different brackets h90a and 91a, respectively.

Apparently, the motor 9 rotates the drum 99 counterclockwise.
8 moves the door 24a to the right in FIG. 2 and into its open position, while rotation of the drum 99 in the opposite direction
Move a toward the left in FIG. 2 to its closed position.

Referring to FIG. 1, the metal heated in the furnace 10 is
When loading from ladle 105, the ladle is first moved to a position adjacent to the opening 23 using a hook 106, said hook being suspended from an overhead crane (not shown) and attached to the trunnion 107 of ladle 105. Multiply.

The ladle is then tilted to the position shown in solid line in FIG. 1, at which point the heated metal is discharged into the furnace 10.

As the heated metal ladle 35 moves towards the opening 25 and as it is tilted, the door support beam 86 is adjacent to the passage of the upwardly extending hook 106.

A full ladle of heated metal has a relatively large mass and its inertia, and if beam 86
When struck by hook 106 when moving towards 3,
Severe damage may occur, resulting in the door assembly becoming jammed.

The beam is therefore protected by a bumper assembly 110, which is placed in a position where it is most likely to hit the ladle 35.

In a preferred embodiment of the invention, a pair of such bumper assemblies 110a and 110b are provided adjacent the front surface of beam 86, one adjacent each opposite side of aperture 23. .

Bumper assemblies 110a and 110b are the same, therefore, only assembly 110a will be discussed in detail for the sake of brevity.

Bumper assembly 110a, as shown in FIGS.
Bumper plate or shield 112 elastically mounted on
Contains.

The transverse beam assembly 114 is supported at each of its opposite ends by vertical support posts 118 located behind the beam 86.

The buffer assembly 116 includes a pair of buffers 120, 121 provided on the upper and lower surfaces of the horizontal beam assembly 114, a plate 112 placed on the beam assembly 114, and a pair of buffers 120, 12 provided on the upper and lower surfaces of the horizontal beam assembly 114.
1 includes a link device 123 that is connected to the link device 123.

The plate 112 has a generally flat portion 125 and a portion 12
5 and extends diagonally inward therefrom, with its lower end located below the center of beam 86.

A plurality of strut members 128 are attached to the rear surface of the plate 112, as well as to upper and lower brackets 130, 132, respectively, which are generally spaced apart and placed at the corners of the flat plate portion 125. There is.

Link assembly 123 includes a pair of upper arms 134 and a pair of lower arms 136, each comprising a pair of parallel link members.

Arms 134 and 136 are connected to beam 114 via a pair of parallel shafts 138 and 140, which shafts are rotatably journalled parallel to each other on beam assembly 114 by bearing support 142, and each The end of the shaft is received.

The arm 134 has a lower end attached to a shaft 138 by a bub member 144, and an upper end of the link member forming the arm 134 is bridged by a pin 146, which is connected to a cam follower 147 received in a slit 149 formed in the bracket 130. support.

The arm 136 is similarly connected to the shaft 1 by a bubble member 150 at its upper end.
40, and its lower end is pivotally connected to the bracket 132 by a pin 151.

Shock absorbers 120 and 121 are connected to cylinders 153 and 1 mounted above and below beam assembly 114 by brackets 155, respectively.
54 included.

Plungers 157 and 159 are connected to cylinders 153 and 15, respectively.
4 and each engage one of a pair of rollers 158 and 159, which rollers extend from arms 161 and 1, respectively.
62.

The other ends of arms 161 and 162 are attached to shafts 138 and 140, respectively, by members 163 and extend upwardly and downwardly therefrom.

When bumper plate assembly 112 is struck by a cable or other structure supporting a ladle of molten metal, the pivoting of axes 138 and 140 and the pivoting between plate 112 and arms 134, 136 will cause the plate to rearward and its From the rest position, it is displaced in a direction parallel to the path, allowing collision energy to be absorbed by the shock absorbers 153 and 154.

This occurs regardless of where plate assembly 112 collides.

After the collision, the return springs of shock absorbers 153 and 154 (not shown)
returns bumper plate assembly 112 to its starting position.

In this way, the impact of the molten metal ladle can be absorbed without damaging the door support assembly.

FIG. 7 shows another embodiment of the present invention in which each bumper plate 170 is connected to a pair of parallel horizontal beam members 170.
The ends thereof are attached to a pair of arms 174, only one of which is shown in FIG.

One of the arms 174 is positioned adjacent to each vertical column 186, each column having a forwardly curved extension 176 at its upper end.
A shaft 177 is rotatably supported between them.

Each arm 174 is attached at its upper end to a shaft 177 and is attached to a post 86
A roller 179 is supported between both ends so as to engage a plunger 181 of a shock absorber 182 provided above and horizontally between the column and the arm 174.

It will be appreciated that a pair of bumper plates 170 are provided on the beam 172 in the same position relative to the door as in the assembly of FIG.

When any of the bumper plates 170 is struck by a ladle hook, the entire assembly of plate 170, beam 172 and arm 174 pivots about axis 177 toward the bumper 182.

The impact energy is absorbed by shock absorber 182 which returns plate 170 and arm 174 to their initial non-swiveled position.

[Brief explanation of drawings]

FIG. 1 is a side elevational view, partially in section, of a converter surrounding device of the present invention; FIG. 2 is a front elevational view of a portion of the device shown in FIG. 1;
3 is a side elevation view of the bumper assembly of the present invention, FIG. 4 is a view taken along line 4--4 of FIG. 3, and FIG. 5 is a top view of the assembly of FIG. 6 is a front view of the assembly shown in FIG. 3, and FIG. 7 is a diagram showing another embodiment of the present invention. 10... Bottom blowing converter, 12... Lining, 13... Tuyere, 14... Trunnion ring, 16... Metal Surrounding device, 23...
...Opening, 24... Enclosure door assembly, 27
... Smoke hood, 32 ... Movable skirt, 33 ... Cooling fluid inlet manifold, 35 ...
... Tribe, 44 ... Supplementary source food, 60
...Support assembly, 75a, 75b...
Rail, 83...Roller, 85...Vertical column, 95a, 95b...Drive assembly, 98.
... Drive motor, 99 ... Drum, 10
1... Cable, 102... Second drum, 106... Hook, 110a, 110b.
... Bumper assembly, 114 ... Lateral beam assembly, 116 ... Buffer assembly, 120, 12
1...Buffer, 123...Link mechanism, 134...Upper arm, 136...
Lower arm, 142...Bearing support, 147.
...Follower, 149...Slit, 15
1... Pin, 153, 154... Cylinder, 157, 159... Plunger, 161
, 162...Arm, 170...Bumper plate, 174...Arm, 182...
Buffer, 186...Vertical column.

Claims (1)

[Claims] 1. A top wall 17 located above the furnace, a front wall 20 adjacent to the furnace and extending downward, and a door 2 formed on the front wall.
An enclosing device for a pivotably mounted metallurgical furnace 10 having an opening 23 closable by 4 and having an open upper end, comprising a bumper arrangement adjacent to the door arrangement, a support 114, 118, an enclosing A plate arrangement 112 is provided having a first side facing outwardly from the arrangement, said plate arrangement having an initial position and exerting a limited pivoting movement towards the enclosing arrangement upon impact with the ladle moving towards said opening. a damper 120, 121 mounted on the support device such that the plate device is located adjacent to the plate device and configured and arranged to resist movement of the plate device toward the enclosing device;
The buffer is configured to absorb impact energy caused by the engagement of the one-river with the plate arrangement and to flex to allow movement of the plate arrangement towards the furnace. A rotatably provided enclosing device for a metallurgical furnace 10, characterized in that it operates to return it to its initial position. 2. The plate arrangement comprises a plate 112 with a first surface facing away from the enclosing arrangement, and an arm arrangement 134, 136 pivotally mounted on the supports 114, 118, said plate being mounted on said arm arrangement. , wherein the shock absorber is arranged to resist the pivoting of the arm device toward the enclosing device that occurs as a result of the engagement of the plate device with the ribs 1 to 2. Siege device. 3. Claims characterized in that the arm arrangement includes a first arm 134 pivotally mounted on the supports 114, 118 and a second arm 136 pivoting with the first arm and engaging the shock absorber. 2. The enclosing device according to 2. 4. A shaft device 138 rotatably provided on the support device.
140, said first and second arms 134.13
4. The enclosing device according to claim 3, wherein said shaft device is fixed to said shaft device and is rotatable therewith. 5 first and second axle devices 138, 140 are rotatably mounted on the support device, the arm device including a first pair of arms 134 attached to the first axle device 138 and extending upwardly therefrom; Opposite ends of the arms are pivotally connected to the plate arrangement 112 and are attached to and extend downwardly from the second shaft arrangement 140, with opposite ends of the second pair of arms pivotally connected to the plate arrangement. The enclosing device according to claim 2, characterized in that: 6 said arm arrangement includes a fifth arm 161 attached to said first axis arrangement 138 and extending upwardly therefrom, and a sixth arm 162 attached to said second axis arrangement 140 and extending downwardly therefrom; a first shock absorber 120, the shock absorber being provided on the support device and capable of engaging the fifth arm; and a second shock absorber 121, the shock absorber being provided on the support device and capable of engaging the sixth arm. An enclosing device according to claim 5, characterized in that it comprises: 7 Sliding connections 146, 147, 149 in which one of the first and second pairs of arms 134, 136 is pivotable;
7. The enclosing device according to claim 6, wherein the enclosing device is connected to the plate device by. 8. The enclosing device according to claim 2, wherein a shaft 177 is rotatably provided on the support device, and the arm device 174 is attached to the shaft. 9. Claim characterized in that the door support device 85, 86 is independent of the support 114, 118, and the plate device is arranged on the support 114, 118 between the door support 85, 86 and the ladle. The enclosing device according to any one of ranges 1 to 8. 10. The enclosure device of claim 9, wherein the bumper device includes a pair of bumper assemblies 110a, 110b movably mounted in horizontally spaced relationship on supports 114, 116.